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Virtual Private Networks (VPN) 10-1
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The Netopia R310 Router offers both PPTP and ATMP tunneling support for Virtual Private Networks (VPN).
Note: VPN is an optional add-on to the Netopia R310. Order TER/VPN2 from the Netopia Web site at
www.netopia.com or from your Netopia reseller.
The following topics are covered in this chapter:
■ “Overview” on page 10-1
■ “About PPTP Tunnels” on page 10-4
■ “Encryption Support” on page 10-7
■ “VPN Default Answer Profile” on page 10-8
■ “VPN QuickView” on page 10-9
■ “Dial-Up Networking for VPN” on page 10-10
■ “Installing the VPN Client” on page 10-14
■ “About ATMP Tunnels” on page 10-16
■ “Allowing VPNs through a Firewall” on page 10-20
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When you make a long distance telephone call from your home to a relative far away, you are creating a private
network. You can hold a conversation, and exchange information about the happenings on opposite sides of the
country, or the continent, that you are mutually interested in. When your next door neighbor picks up the phone
to call her daughter at college, at the same time you are talking to your relatives, your calls don't overlap, but
each is separate and private. Neither house has a direct wire to the places they call. Both share the same lines
on the telephone poles (or underground) on the street.
These calls are virtual private networks. Virtual, because they appear to be direct connections between the
calling and answering parties, even though they travel over the public wires and switches of the phone
company; private, because neither pair of calling and answering parties interacts with the other; and networks,
because they exchange information.
Computers can do the same thing; it's called Virtual Private Networks (VPNs). Equipped with Netopia R310s, a
single computer or private network (LAN) can establish a private connection with another computer or private
network over the public network (Internet).
The Netopia R310 can be used in VPNs either to initiate the connection or to answer it. When used in this way,
the routers are said to be tunnelling through the public network (Internet). The advantages are that, like your
long distance phone call, you don't need a direct line between one computer or LAN and the other, but use the
local connections, making it much cheaper; and the information you exchange through your tunnel is private and
secure.